diff --git a/core/files/media_v2.py b/core/files/media_v2.py
index d62ee98..9cc8f23 100644
--- a/core/files/media_v2.py
+++ b/core/files/media_v2.py
@@ -33,7 +33,7 @@ def media_urls(request, hash):
                             headers={
                                 'X-Accel-Redirect': f'/redirect_media/{hash_path}',
                                 'Access-Control-Allow-Origin': '*',
-                                'Cache-Control': 'max-age=31536000, private',
+                                'Cache-Control': 'max-age=31536000, private, immutable',
                                 'Expires': datetime.utcnow() + timedelta(days=365),
                                 'Age': 0,
                                 'ETag': file.hash,
@@ -74,7 +74,7 @@ def thumbnail_urls(request, size, hash):
                             headers={
                                 'X-Accel-Redirect': f'/redirect_thumbnail/{size}/{hash_path}',
                                 'Access-Control-Allow-Origin': '*',
-                                'Cache-Control': 'max-age=31536000, private',
+                                'Cache-Control': 'max-age=31536000, private, immutable',
                                 'Expires': datetime.utcnow() + timedelta(days=365),
                                 'Age': 0,
                                 'ETag': file.hash + "_" + str(size),